From owner-freebsd-stable@FreeBSD.ORG Mon Mar 28 19:26:50 2011 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id A7BAB1065694 for ; Mon, 28 Mar 2011 19:26:50 +0000 (UTC) (envelope-from alexander@leidinger.net) Received: from mail.ebusiness-leidinger.de (mail.ebusiness-leidinger.de [217.11.53.44]) by mx1.freebsd.org (Postfix) with ESMTP id 60FD38FC20 for ; Mon, 28 Mar 2011 19:26:50 +0000 (UTC) Received: from outgoing.leidinger.net (p5B1548A0.dip.t-dialin.net [91.21.72.160]) by mail.ebusiness-leidinger.de (Postfix) with ESMTPSA id EA625844017; Mon, 28 Mar 2011 21:26:23 +0200 (CEST) Received: from unknown (IO.Leidinger.net [192.168.2.110]) by outgoing.leidinger.net (Postfix) with ESMTP id 04FD817DA; Mon, 28 Mar 2011 21:26:20 +0200 (CEST) Date: Mon, 28 Mar 2011 21:26:21 +0200 From: Alexander Leidinger To: Claus Guttesen Message-ID: <20110328212621.0000696d@unknown> In-Reply-To: References: X-Mailer: Claws Mail 3.7.8cvs47 (GTK+ 2.16.6; i586-pc-mingw32msvc) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-EBL-MailScanner-Information: Please contact the ISP for more information X-EBL-MailScanner-ID: EA625844017.A0150 X-EBL-MailScanner: Found to be clean X-EBL-MailScanner-SpamCheck: not spam, spamhaus-ZEN, SpamAssassin (not cached, score=-1, required 6, autolearn=disabled, ALL_TRUSTED -1.00) X-EBL-MailScanner-From: alexander@leidinger.net X-EBL-MailScanner-Watermark: 1301945185.82507@4GIXGzBYTD3UEn7xKIio2w X-EBL-Spam-Status: No Cc: FreeBSD Stable Subject: Re: zfs, nfs and zil X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 28 Mar 2011 19:26:50 -0000 On Mon, 28 Mar 2011 18:50:29 +0200 Claus Guttesen wrote: > > However, the better solution, and the one most recommended for those > > using NFS with ZFS, is to install a small, write-optimised, > > SLC-based SSD to the system as a separate log (SLOG/ZIL) device. > > > > NFS is a very sync-heavy protocol, and having a super-fast ZIL > > sitting on a separate SSD will greatly improve things. > > Thank you. I'll get a ssd-drive (also suggested by Alexander). You need to be aware that the same redundancy concerns apply to the log device as for the normal pool. If you only have one SSD, as soon as it crashes you lose data. If you have two in a mirror, you can survive the loss of one. Bye, Alexander. -- http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7 http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137